Return the index of the maximum element in a list

Question

I have calculated the histogram of different pixels using the following statement:

pixel_histogram = [float(x)/float(number_of_pixels) for x in pixel_frequency]

If I want to return the maximum element in the list, I would simply do the following:

max(pixel_histogram)

How can I return the index of this maximum element?

Thanks.

try `np.argmax()` or `pixel_histogram.index(max(pixel_histogram))` — Ghilas BELHADJ, Jan 30 '18 at 14:58
Possible duplicate of [Pythonic way to find maximum value and its index in a list?](https://stackoverflow.com/questions/6193498/pythonic-way-to-find-maximum-value-and-its-index-in-a-list) — Chris_Rands, Jan 30 '18 at 15:01

score 0 · Answer 1 · answered Jan 30 '18 at 15:00

0

You can use enumerate():

max_index, max_value = max(enumerate(pixel_histogram), key=lambda x: x[1])

Example:

>>> l = [1, 3, 6, 2, 3, 5]
>>> max_index, max_value = max(enumerate(l), key=lambda item: item[1])
>>> max_value
6
>>> max_index
2

answered Jan 30 '18 at 15:00

ettanany

score 0 · Answer 2 · answered Jan 30 '18 at 15:03

0

If you want the first occurence of the maximum element in the list, you can use

pixel_histogram.index(max(pixel_istogram))

oherwise, you should specify the parameters that you want to consider for choosing which "max" is correct

answered Jan 30 '18 at 15:03

Gsk

2 Answers2